Suzuki XL7 2007 Service Manual page 1239

Step
1. Inspect the brake master cylinder for internal fluid leaks.
Refer to "Brake System Internal Leak Test".
2. Replace the brake master cylinder if it is found to be
20
leaking brake fluid internally. Refer to "Master Cylinder
Replacement".
Did you find and correct a condition?
Install or connect components that were removed or
disconnected during diagnosis.
21
Did you complete the operation?
Brake Assist System Diagnosis
Step
DEFINITION: This diagnostic table is designed to diagnose ONLY the components of the brake ASSIST system in
order to determine if the brake ASSIST system is operating properly. You will be directed by the appropriate
Symptom table to go to other brake system diagnostic tables as appropriate.
1 Were you sent here from a Brake Symptom table?
Were you sent here directly from an electrical diagnostic to
2 investigate vacuum as a possible concern?
Inspect for proper brake pedal travel. Refer to "Brake Pedal
3 Travel Measurement and Inspection".
Is the brake pedal travel distance within the acceptable limits?
1. Inspect for worn, missing, misaligned, bent, or damaged
brake pedal system components.
– For the brake pedal pushrod component inspection,
refer to "Brake Pedal Pushrod Inspection".
– Inspect the brake pedal bushings for excessive wear
4
and/or damage and inspect the brake pedal for a
misaligned, bent, and/or damaged condition.
2. Replace the brake pedal system components that are
worn, missing, misaligned, bent, or damaged.
Did you find and replace any worn, missing, misaligned, bent,
or damaged brake pedal system components?
Check the engine vacuum source that supplies vacuum to the
vacuum brake booster. Refer to "Brake System Vacuum
5
Source Test".
Is the vacuum reading within the acceptable limits?
6 Does the condition occur during cold start-up conditions?
Check engine vacuum under the same cold start-up
7 conditions. Refer to Engine Controls Diagnostics.
Did you find and correct a condition?
During the vacuum source test, did the vacuum booster check
8
valve operate properly?
Replace the vacuum booster check valve. Refer to "Vacuum
9 Brake Booster Check Valve and/or Hose Replacement".
Did you complete the replacement?
If equipped with a booster mounted separate vacuum sensor,
inspect the vacuum sensor grommet for cracks, cuts, dry-rot,
10 or damage.
Does the vacuum sensor grommet exhibit any of the
conditions listed?
Replace the vacuum sensor grommet.
11
Did you complete the replacement?
Action
Action
Brake Control System and Diagnosis:
Yes
Go to Step 21
Hydraulic Brake
System OK
Return to Symptom
Table
Yes
Go to Step 3
Go to Step 5
Go to Step 5
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 18
Go to Step 10
Go to Step 10
Go to Step 11
Go to Step 12
4A-20
No
Return to Symptom
Table
—
No
Go to Step 2
Go to "Diagnostic
Starting Point -
Hydraulic Brakes"
Go to Step 4
Inspect for internal
and external fluid
leaks and air in the
hydraulic brake
system
Go to "Hydraulic
Brake System
Diagnosis"
Go to Engine Controls
Diagnostics
Information
Go to Step 8
Go to Step 9
Go to Step 9
—
Go to Step 12
—